Farihi and his team looked at 146 white dwarfs detected by the sloan digital sky survey that show the spectral signature of calcium pollution .
farihi及其团队观察了斯隆数字巡天项目探测到的带有特定钙污染光谱标志的146颗白矮星。
For example , imagine the wonder at detecting spectral features that cannot not explained by complex organic chemistry , like laser emissions .
比如,用激光探测光谱特性,这些特性是无法用复杂的有机化学来解释的。
The only thing that makes the distinctive spectral features of methane on mars worth looking for is that spectral lines caused by methane on mars are offset compared with the same lines caused by methane on earth , thanks to the relative movement of the two planets .
Something strange had happened to the light during the 12 billion years it took to cross the universe : its spectral composition , the different colours within the light , had changed .
Initially , the researchers observed pulse shortening due to relativistic transparency and consistent spectral broadening . Later , they also measured the shape of the laser pulses incident on and transmitted through the plasma to directly observe the transparency .
As the telescope scanned the sky , the spacecraft 's spectral and photometric imaging receiver , spire , and photoconductor array camera and spectrometer , pacs instruments snapped the pictures .
Haqq-misra explained that astronomers are currently capable of detecting spectral changes in light coming from large ( jupiter-size ) planets up to 200 light-years away .
哈克-米斯拉解释,目前天文学家能够检测到离地球200光年大型行星(木星大小)的光谱变化。
While brown dwarfs have measured surface temperatures of up to 1400 degrees c ( 2600 degress f ) , this brown dwarf , assigned to spectral class y , has the estimated temperature of a warm room , less than about 27 degrees c ( 80 degrees f ) .
Of course , solar irradiance measurements from just three years of one solar cycle cannot be applied to any other period than the one measured by the spectral irradiance monitor on nasa 's solar radiation and climate experiment ( sorce ) satellite .
One possibility they 've raised has garnered more attention than any other : an extraterrestrial civilization might notice our planet by detecting changes in the spectral signature of earth - the light radiated by our planet and atmosphere - caused by greenhouse gas emissions .